Many folks are asking how to identify counterfeit Cisco gear that may be their environment. Continue reading for how we did it.

Our biggest counterfeit problem was with SFPs and GBICs. Our investigation showed we received them from a number of sources (all Cisco registered resellers), including a Cisco Gold partner.

We initially detected them due to shoddy packaging: labels that smear, cheap boxes, etc. The Cisco logo used was several generations old. Cisco is usually diligent on labeling: the serial number on the device matches the number on the bag (or box).

The counterfeit gear had a label/serial number on the device, but no serial number on the bag or box.

Once we investigated, there was a clear pattern on the counterfeit gear, regarding bogus serial numbers.

The key is the serial number (bolded), which is in the standard Cisco format for SFPs: 3 letters, followed by 4 numbers, followed by 4 letters/numbers. The 1st 3 letters are the factory, the next 4 numbers are a date code, and the last 4 letters/numbers are a unique ID.

Note the serial number 'H11F797' is not in the standard (longer) format. This is very typical, and how we identified hundreds of bogus SFPs that were in production. The initial letter changes (we saw some begin with H, and P).

Also, in restrospect, we realized the counterfeit devices had a far higher failure rate than real Cisco. We shipped the questionable SFPs to Cisco Brand Protection Labs, and they verified all were counterfeit.

Here's a photo of an SFP that appears to be counterfeit:

Note the serial number. This photo was taken from a reseller located in Asia. This SFP is priced for $20 on that site (a real SFP from a legitimate Cisco reseller lists for hundreds). That seller has plenty of other "Cisco" equipment for sale at equally impressive discounts compared to legit gear:

CISCO GBIC&SFP

CISCO MODULE

WIC CARD

NETWORK MODULE(NM)

VWIC CARD

VIC CARD

1700 SERIES

1800 SERIES

2800 SERIES

2950 SERIES

2970 SERIES

3560 SERIES

All of this stuff ends up in secondary channels like Ebay. Some Cisco certified resellers get greedy, buy the counterfeit stuff for pennies on the dollar, and then resell it a 'great discount.' All of this violates their Cisco reseller agreement, but greed seems to win the day.

We got ours for 50% off Cisco list. These parts listed for $500 then (they are less now). We got a bargain price of $250: for a $20 knockoff.